Fri 9 Nov 2018 11:37 - 12:00 at Studio 2 - Program Synthesis Chair(s): Jens Palsberg

We present FixML, a system for automatically generating feedback on logical errors in functional programming assignments. As functional languages have been gaining popularity, the number of students enrolling functional programming courses has increased significantly. However, the quality of feedback, in particular for logical errors, is hardly satisfying. To provide personalized feedback on logical errors, we present a new error-correction algorithm for functional languages, which combines statistical error-localization and type-directed program synthesis enhanced with components reduction and search space pruning using symbolic execution. We implemented our algorithm in a tool, called FixML, and evaluated it with 497 students’ submissions from 13 exercises, including not only introductory but also more advanced problems. Our experimental results show that our tool effectively corrects various and complex errors: it fixed 43% of the 497 submissions in 5.4 seconds on average and managed to fix a hard-to-find error in a large submission, consisting of 154 lines. We also performed user study with 18 undergraduate students and confirmed that our system actually helps students to better understand their programming errors.

Fri 9 Nov
Times are displayed in time zone: (GMT-05:00) Guadalajara, Mexico City, Monterrey change

10:30 - 12:00: OOPSLA - Program Synthesis at Studio 2
Chair(s): Jens PalsbergUniversity of California, Los Angeles
splash-2018-OOPSLA10:30 - 10:52
Yuepeng WangUniversity of Texas at Austin, Xinyu WangUT Austin, Isil DilligUT Austin
splash-2018-OOPSLA10:52 - 11:15
Pavol BielikETH Zürich, Marc FischerETH Zurich, Martin VechevETH Zürich
splash-2018-OOPSLA11:15 - 11:37
Chenglong WangUniversity of Washington, USA, Alvin CheungUniversity of Washington, Rastislav BodikUniversity of Washington
splash-2018-OOPSLA11:37 - 12:00
Junho LeeKorea University, Dowon SongKorea University, Sunbeom SoKorea University, Hakjoo OhKorea University